556442665 has 4 divisors (see below), whose sum is σ = 667731204. Its totient is φ = 445154128.

The previous prime is 556442651. The next prime is 556442669. The reversal of 556442665 is 566244655.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566244655 = 5 ⋅113248931.

It can be written as a sum of positive squares in 2 ways, for example, as 248755984 + 307686681 = 15772^2 + 17541^2 .

It is a cyclic number.

It is not a de Polignac number, because 556442665 - 2¹⁵ = 556409897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556442669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55644262 + ... + 55644271.

It is an arithmetic number, because the mean of its divisors is an integer number (166932801).

Almost surely, 2^556442665 is an apocalyptic number.

It is an amenable number.

556442665 is a deficient number, since it is larger than the sum of its proper divisors (111288539).

556442665 is a wasteful number, since it uses less digits than its factorization.

556442665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111288538.

The product of its digits is 864000, while the sum is 43.

The square root of 556442665 is about 23589.0369663537. The cubic root of 556442665 is about 822.5080187563.

The spelling of 556442665 in words is "five hundred fifty-six million, four hundred forty-two thousand, six hundred sixty-five".